Oil-well fishing tool



May 15, 1923. 1,455,257

A F. C. BONNET ET AL OIL WELL FISHING TOOL Filed Jan. 5,'1922 Patented May l5, 1923.

d MMT- Ef ST fraEDnRroK o. BoNNEnor neurons, New YORK, AND RAYMOND FRANKLIN, or

f DURANT, OKLAHOMA.

OILWELL FISHING TOOL.

To all/whom it may-concern 1 Be it known that we, FREDERICK (l. BONNET and RAYMOND FnANKLiN, citizens `of the United States, residing, respectively, 'at Hamburg, inthe county of Erie and State of New York, and Durant, county of Bryan, and Stateof Oklahoma, have invented a new and` useful Improvement in Oil-Vell Fishing Tools, of which the following is a specicati'on This invention relates to improvements in tools of the kind commonly called fishing tools and which are used for the purpose ofA removing pieces or parts of drilling equipment or the like from an oil well.

Fishing tools as heretofore made usually Y include-'a slip socket of some sort which is Y however, the part is located atV an inclina-i adapted to be slipped over the end of the broken tool or other part which is to be relimoved from an oil well, and these4 implementsV are very. satisfactory in their operation when the part to be removed is substantially. centrally located within the well. If',

tiont'oftheaxis of the well, in sucha manner that the fishing tool cannot be slipped over the-part to beremoved, great diiculty is experienced in removing the part which is sofpositioned.

The objects of this invention are to provide a fishing tool of the usual Vkind with a magnetic attachment whereby an articlel or part to be removed from a well may be moved into a. position tobe engaged by the usual. slip socket; also to improve the construction ofv oil well shing tools of thisV kind in the other respects hereinafter specilied.

In the accompanying drawings:

\ Fig. l is a sectional levation of a shing toolprovided with a magnetic attachment embodying.y the invention, showing'the same arranged in an oilwell; i

Fig. 2 isa centralsectional elevation of the magnetic device.

Fig. 3 is a top plan view thereof, partly. in section. V

A represents a slip socket or gripping de# vicetwhich may be of any usual orsuitable construction, that shown being of a type commonly used, including a pair of gripping'members c a, provided on their inner faces with teeth adapted to engage the article to be removed from the well and having their 'outer faces formed to cooperate with Serial No. 526,676.

inclined faces c a. of the slip socket. The gripping members are slidably arranged in the body portion of the-slip socketand are moved upwardly by an article entering the vsocket and are drawn downwardly against the inclined faces andinto gripping engagement with an article when the same is moved outwardly with reference tothe slip socket'. The upper end of the socket is provided with the usual threaded stem asgadapted toengage some portion of the well drilling device indicated in dotted linesrat c3 in Fig. l. l/Vhen a slip socket of this kind is lowered into a well to remove an article such, for example, as indicated by B in Fig. l, theslip socket is lowered so that the article enters into the same. When the slip socket is raised,'the teeth of the gripping members a hold the article B and make it possible to extract the same from the oil well. When, however, an article becomes lodged in a well in the Inanner shown, for example, inV dotted lines at B', Fig. l, a slip socket of this kind cannot be successfully used, since in lowering' the same the. article will not enter into the slip socket, but will tend to become lodged more securely in its inclinedposition by the weight of the slip socket bearing thereon.

In order to bring the upper end of the article to be removed from the well into substantially the center of the well, in which position it can-be engaged' by any of the fishing tools commonly used, we provide a magnet, preferably .an electromagnet which` is so constructed as to draw thefupper end 'of the article substantially into the central axis of the well. In order to enable the magnet to act in this manner upon the article, the magnet is preferably madehollow, being in the construction shown, provided with a tubular core which is made large enough to permit the article to be removed from the well to enter into the hollow core. In the construction shown, an electromagnet is usedy having a hollow or tubular core C around which a winding or coil D is arranged, the core being' made of magnetic material. The upper end ofthe core is preferably arranged in such a way that t-he magnet can be supported from the lower end of the slip socket and for this purpose a threaded bushing or sleeve E is provided, having a threaded engagement with the upper end of the core C and also adapted to engage the lower end of theslip socket A for selll) The bushingV or sleeve E is preferably,

though not necessarily, made of non-magneticmaterial so as to avoid excessive mag- .the central axis of the well.

the fact that the ring Cr of non-magnetic netizing of the slip socket, which might in some cases interfere with the proper operation thereof. Any other means for securing the magnet on the end of the slip socket .C may be provided. 'Ihe outer lace or the winding. or coil D may be covered with, a protecting sleeve or shield F or the like.

In order to enable the device to operatev in such a manner as to move the article in the well toward the central axis of the well,

vthe lower end of the magnetis provided with a ring or sleeve G of non-magnetic material. This ring may be or' any suitable or desired form, that shown being provided with a beveled, inner tace g and is secured to the lower end of the core C in any suitable manner, for example by means of screw threads. lVhe'n the magnetic device is in close proximity to the upper end of the article to be removed from the well, the magnetism acts insuch a manner as to tend to draw the upper end of the articlein the ,well toward material prevents the magnetism from being concentrated at the lower edges of this ring, as would happen if the ring Cr were made of magnetic material, in which case .the article in the well would tend to adhere to the lower extremity of the ring and would vnot tend to straighten out or move intothe central axis of the well. Since thering Cr is made of non-,magnetic material the great-V est magnetic force is exerted at the lower end ofl the hollow core C7 which is arranged within the bell-shaped mouth of the ring Gr. Consequently the hollow core C tends, to attract the article in the well. and to act upon the same in such amanner as to move it,`

toward the central axis of the well, and when the article assumes this position, the magnet, together with the slip socket, is lowered so that the article passes through the hollow core C and upwardly into the slip socket` where it is engaged .by the toothed gripping members a in the usual manner. removed from the well.

(Z d represent a pair of `conductors con nected with theends of the coil I) of the electromagnet and extending through the slip socket A, they conductors extending upwardlyout of the well.

In the use of the magnet for recovering an article lost in an oil well, `the magnet attached to the gripping device or slip socket This isy due to The article can then be readilyl is loweredA into the well until it rests on the article to be recovered. Electric current is then passed through the magnet coil and energizes the core. VThe magnet is then raised slightly so as to 'permit the article to move'toward the central axis of the well, due to magnetic action. The magnet and thev gripping device connected therewith are then lowered so that the'article passes upwardly through the hollow core and into` engagement with the grippingV members of the slip socket. The magnetism is thenno longer needed so thatthe supply of current to the `magnetcoil may be interrupted. The magnet need not be in anyway depended upon to raise the article out offthewell, but serves for the purpose-of placing articles into positions to be engaged by the gripping device. It will be noted that by providing the non-magnetic ring G with an in! ner beveled tace, the magnetism need not move the article into an entirely central position, it being only necessary to move the articleinto a position in which the nonmagnetic ring may slip over the upper edge ot the article, whereupon the beveled inner il'ace of this-ring will guide the article and slip socket intoengagement with each other.

l/Ve claim as our invention:

l. In a device for removing articles from wells, the combination of a slip socket and a hollow magnet secured to the` lower end ofthe slip socket and through which .an article toege removed from a well: may pass to the slip socket for engagement .therewith.

2. In a devicefor removing articles :froml wells, ,the combination of a grippingdevice adapted to engage an article, and a hollowmagnet arrangedbelow said gripping devicev and adapted to movethe articleinto a position to be `engaged, by said gripping device.

3.. In a device fo'rremoving articles Jfrom wells, 4the combinationof a gripping device adapted to engage an article, a hollow magnet arranged below said gripping device and adapted to move the article into a po.- sition to be, engaged by saidgripping Vdevice, and ak ring of non-magnetic material secured to the lower end of said magnet and which causes themagnet to move the article into a central positionin the well.

LI. In a device for removing articles `from wells, the combination of a gripping device adapted to engage an article, Vand. an elec` tromagnet arranged below said gripping device and having a hollow coreawhich is substantially in alinement with said.V gripping device, whereby themagnetism insaid core draws the article ysubstantially into the wells, the combination of a gripping device adapted to engage Van article, an electromagnet arranged below said gripping device and having a hollow core which is sub.- stantially in alinement with said gripping device, and a ring of non-magnetic material securedto the lower end of said core and extending below the same, whereby the magnet, when in proximity to the article, will tend to move the article toward the axis of the well.

6. In a device for removing articles from wells, the combination of a gripping device adapted to engage an article, an electromagnet arranged below said gripping device and including a coil, a tubular core about which said coil is arranged, said core extending below saidy coil, and a ring of non-magnetic material arranged on the lower end of said core and extending below the same.

7. In a device for removing articles from wells, the combination of a gripping device adapted to engage an article, an electromagnet arranged below said gripping device and including a coil, a tubular core about which said coil is arranged, said core extending below said coil, and a ring of non-magnetic material arranged on the lower end of said core and extending below the same and having an inner beveled face, the upper edge of which terminates at said core.

8. In a device for removing articles from wells, the combination of a gripping device adapted to engage an article, and a coil of wire suitably mounted on the lower end of said gripping device and adapted to be energized by electric current to move an article toward the central axis of the well.

9. In a device for removing articles from wells, the combination of a gripping device adapted to engage an article, an electromagnet arranged below said gripping device and including a coil, a tubular core about which said coil is arranged, -a nonmagnetic member adapted to be secured to the lower end of said gripping device and to said core for supporting said core on said gripping device, and a non-magnetic ring secured to the lower end of said core and adapted to hold the article out of engagement with said core until the article has been moved into a substantially central position in the well.

FREDERICK C. BONNET. RAYMOND FRANKLIN. 

